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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3493f5c70b35afc6ba1354e42a54247997036e8a8ea900d82f7e1aca0bf04247' 
  AND token = '/WGxYlsshbo1ln9J+nx37fKBEIAh/VZWf/QuuVxfn4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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