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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa71cdb878e7c30a093155b851d514c94e34d1b264de1af75295ee62a859ad7' 
  AND token = 'OGyDom9dt5mp3LCkho7aImgxMjG28rCFCCg+SKoUmyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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