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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7c0cf412915e34ca4d4bf56e443aad12736ad61eeeab0065919db83ca65a23' 
  AND token = 'Goc68gaGajsnByULWeBHkMHMPDivI5844hSI6fiEI+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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