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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4452ed242779ad44a1f17375e54174ee98cc6924c8d541872f7ae4c1316b43' 
  AND token = 'Q5pFZ8PeLSveYXY8QfgzJrkQPVr/wGbdfUbNrPSGvYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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