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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6910ec69e7b0fad317a273a3923335f5d5fe2b600ced5305aac2bac8e4ead197' 
  AND token = '9y/eRKiF5oT7l8Yk/iTKYGAAko1GuleofU4SJaUSXsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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