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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bf6f301a1bfc8991e800af4d89c6c93b47cee2f6f4d270d9f5e57a69837a17' 
  AND token = 'IfQyBx4VJYXUzYfA4T+caCdthFvxe7I+UIEIJdO40iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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