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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afec1d6ad8456d816841576658afdbcb5c8cce559f86f18a83e2e72445ec010' 
  AND token = 'i6hDdYAZKLdJGKZUsbnrcv8s8N7POE92DE1G74+YN08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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