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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37da1d9eee92f467598bcf546a9185daddae2ae25866674653d886649bf623f8' 
  AND token = 'QA9x48ItJ0ZYpxlrUqJ0n+StrVDzJy5Cx6ew3ovgl/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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