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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2607db2659a70f75f905d73136db87cea44c44939dc069192b97cf7b8390f3' 
  AND token = 'CE5UVydXF9FNHdzUsER8Tka7xBctGTavyGXU1NJCCG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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