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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53efe6c1fb8d9e66da9427c7861628b27b19b9c77a90408863e698061c5c536' 
  AND token = 'J2UFomObmWCWrHvCtbsZ2El16jjJSqsEPDafjCDX7+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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