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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde4f359ba32f45b96c12f9b49161c933ade9a2ab89c5f1075fc4f3ec6cc1909' 
  AND token = '4fRsNMlFlWwZpONh4xbu1YmBz59mhzWLVLETJ0CCCgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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