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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fbf00571de67ce0b631c83d5e39dfb4bd0cda446747b9bcb09763bb525ea25' 
  AND token = 'nDrSAJcqeJAnbxCjs1cPgJWfpvoD64I5t0Saxh8cbMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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