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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb321793e7bb6ef954fd63028f03cb27200eee9a075955ad9279b515d2a64093' 
  AND token = 'Nodo+daRqo9c+szTH2o/B5I6TpvyQak4lIf+pS6nh+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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