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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602bd7a70ec71de453fa02c4675b7dfec8078ebfeaa7d4d9baf00b48b7b565d6' 
  AND token = '9ca6e4kP7snbpewSfoBMaCJv/z2ttUfyzsH2E/tHlrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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