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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094f16cf76b2f77d7c97ee7748326fb1615f86dab17608ce8f948fd676074f65' 
  AND token = '2rVnHNDFu2Ck0Bt2WLahyDeOnW2lo5n6GuSPiPX9ZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}