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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adad687061d9389eafb4f736c81e53f438336ebdeeb78bedac12887d05816449' 
  AND token = '0fyNAMkJB4Gqi3yxL/pIL6f0QQKlh8iGsS73nEps0lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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