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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67b28cf905280085131dfdecf8aac762c69042299c1d3beb9f3de5490173e47' 
  AND token = 'El05ksvs3IUwyUI8eBEc8OA4AM9qhelKq4M0DkG48kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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