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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73ccb9aaaeec53abb56b40e6fb93e944e3080362b039b19bf9344f6aed06833' 
  AND token = 'XmVPVQxb48SCk+CTHzeSIbV2UNDGXZPyVwQE3roTqX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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