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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523eaadeeea2b583d4cb3b159c5c41448058272d5d36f0bf0f5e0480d8fdbc62' 
  AND token = 'JX1OYpLOp5GsZ3IL+TrgslsW+zi6mrTguFFRG0dLo+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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