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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42426e19da029c3ae6ecff88852cc9bf395d48a147b1ba21ffcec2d1fb027d6' 
  AND token = '47QpqUKk86XbrJQ7h650qXAju8jApOGMOoF0oLlKVMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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