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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692c839f16cd4f08e585f0708a1a4f6823dbe63611c42d33f8f856e114d5f0ff' 
  AND token = 'mreDqZ3Oo1t/okPaGaiaqRxggr3I0Rc//bwVaoKxsd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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