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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba53f8cc85efee003b70ada87dbb73050c32176b91887935d7c197984196ea4' 
  AND token = 'H15zxaNmipCougN+vMa8S+qCH8t8+vo30ZFoU90Fvt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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