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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02362ec994b6b5cf8bd6376a8ca950bc7ed9ff07ddd792e3c41e2b637d87578c' 
  AND token = 'dvjZT6a94UNu5FgShGdlbVjBdwEfphYfr28ZBVRwi3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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