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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5005dcba6a54c2bb310c4e5483b74f6d06bedcbb2dfc66b9d9cf1b9d17eb53e3' 
  AND token = 'HTWhPxwcYDf6JtOay5fEhRBY6l2k/K3SVHskis4Do0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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