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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f06707d75879505fc3c1768415a8fca320b30883a3fc711ea9224cfd5a7099' 
  AND token = 'X8Vj0LR17RptUmWW9IvgjfVnHB9lBHpelKFPLK9UNCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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