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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f8448c77c341aefce2f1fa24adbd48c9eaf4f0c25e36039908677ff574cdf9' 
  AND token = 'LtWBStyeU59gZ174uo8tMz7eFpkz2JeVe4nM0ie2+tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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