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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217ed6cd08369d6f7539a4da28213b58a7bced64a6dfd592098bff7c0bc8858a' 
  AND token = '9ZqttXHOzcp+TuYf8Rxk/SPEbFpfECkY/uy9KQeIi/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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