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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d05deccb6487d05e714cf7ef0bd1eef3b0c7174bce3b3176a1b1a02aa9f8bbe' 
  AND token = 'xImJzEgGgDErOw66BZHtlu0fxY59XciaejGVFqefpjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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