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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3ab7ce8d8b47397939294fedb7fc0545dfca4ae84374ed43ca3cc568abae4c' 
  AND token = '6dsxvevjASo9g89+VZSCQ/VYiqW49f/7VsUvGXAUDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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