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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97f236960f6877d6d70c9ed695d28c8cf56bd6d858cd1c564cee7897bcc8c97' 
  AND token = '1RliSYJsLmWhdnT9Ce9AX/qLo4HXqzwzDs8KLOI2VWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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