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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fc90692ed768771d86dad51c2b004ba25646771858a28631b2b8c50a7cfca9' 
  AND token = 'Qynxu7fpwM6038M9OEw46xrhKsrN7Z0wV3LbqvPIyRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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