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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a0ad2cd368581ff0a0a9e0cff6e300049704ffcf8816a40cd70acbddf044bc' 
  AND token = 'eLFYwYm3iNed3fxNUFORtD8lHCcv5HDICpAs3eM4iFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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