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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056cd9544f47f7789fa8f4a95fa89e94393c45b59a35c9564b30b235812ba6ca' 
  AND token = 'kHXMT0GCSNAbo6NrPqru2zgn1jiNyrYkDTxPV8BJPRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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