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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37324607ffede8b31b5456235113e2a5f3136d5b45c368ac923dbe36ddc2baa0' 
  AND token = 'gHy/9UXRkWVOU+P6YHW9cz2vyGxbZQb9y0I7lzoMz5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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