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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7abccef67bc2bcb5168043c63d2835b3366526ebf090d3c4ec16702a660ea69' 
  AND token = 'lOtcH/rXJGF2LODzcqxerj+HH88gvIEK1qyh3Lbrtlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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