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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e70678c68a1f364b0a58632398e05c555b57bfbb8d922c664bb3fe01ec67fe8' 
  AND token = 'Hqt/eawXdAz1o2wItKBhndys6bc7Z8X8kBqa2yVpfdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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