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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c8667e9657f4180c94ead4f12ba749ae895a9c79abaaafe221e923881729ad' 
  AND token = 'w++ISoNN2Ydw6VjVI8ouELxn3Qn/cnuMqalCogmOr6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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