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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447a656c72ed6854ef133a9976312e9e1727b2800436806b8b6d97e98317ab26' 
  AND token = 'a40NlJqk6Q+6GDCo9NGEI9F6hMRXbOSGewD2k0Tbdt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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