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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d977879c3e0ac78c0453a148b910c5c7e0f6313ee58a322a8e4bcc023270595' 
  AND token = 'glFzXBXD+3zDBGX4iiO5yHFk8ZDiwoRu7s71Ac9IPjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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