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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5779084403d5f16dbf869d67e35ce74939001d4f3d4f0b129970857af9ad9fc0' 
  AND token = 'rVtxrlQ9P0u6HBXUY0bU7whS280hOAh0D1zTR07z4pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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