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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f197dcc5ff0c8bbcf9e16f450461f24dff7f0a18c40438fd5ca7b3ed8bbea74d' 
  AND token = 'V1m92uiMwAlA5N/5shzaKb9O/1eQRUNzcdHiuJ/A1WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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