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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad5cac1e0b91777f6f1230f7a54e76b5f3150bafd6c75e0614fa3996813b5c4' 
  AND token = 'BSTUjfVS2N7lMiN8Dmy2GN5i++MO3KuLxnAHr+oQ9uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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