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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1201e962483877b3d6603534b548d08cc94e2a6c45577df9e6d5e46299d018' 
  AND token = 'Be0qQh21Q0I6VNYucC4THqCcFHqzrW6A1IpIoql9yHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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