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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c188b24bee5f013751c7e859f10b016610754f0e9eddac9bb0883b4bba0651ee' 
  AND token = 'ibrv7rORrqeZVLBCnHy9ZWAh0+dI2Am1whK1R3klOt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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