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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611bc2326c8646c802a3e706793b51a4bcdb605bd36d5a37adcc2e2bfb1fddcc' 
  AND token = 'AlCKUeW8rAeEEDnxpukeMNDC8xLfeblIEhn0afcXjvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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