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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4f497db27a77a2697bc4e72266d73a7c1a52eb37dfa45483adb53d1b77b3c7' 
  AND token = 'THI73RWYFx26nMtKL6GVbM17mIJcfZlK7+6Ei9+HbP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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