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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a33671964ff7380a99fcb96b626273905889bba4724590a5e1d7e6aaa9c4bf' 
  AND token = 'ZF6XfMl21XA69TdcUNE9a/CV8J/wyduGuMgtOg26/xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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