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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f99a5c84f1393f7b2e58bda97937af4128e3920652af578eef726bf154d270d' 
  AND token = 'iPNqPmecmIBsZQ993moffPt/VzyalNLxpfIFal9E9No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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