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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c434a992a6d1dd61266f9fb28357b4fc764e8baa03616a54e5471e3a72448361' 
  AND token = '2nqvcsLwcwk9KrFE04CFozvKgchYR8V3f9W1T9m1zeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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