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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f997255560c9b17eca7dda8d5db81ff501ea8884d69b0b20235b6522564fc04' 
  AND token = 'y6a3QgdyWMGJNfo3WhA4pdLXS8JZcOvY8XUoIQWDP0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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