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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2ef782d8b13072a82ca5b6b61f2cab789a3a59f8261717e98a4d9cd6b02644' 
  AND token = '9Avna+GKq7ScIsudodTdluT24ucQSVBavbHEtaFpTeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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