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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c702edd2484c8c2e6380accb554c22126e2d1a5d55143c8dfb528e7bd532e364' 
  AND token = '/2MAtxY7Q1tcq9f6wmBGHRf6+v5VXUUtjpC6uIq+xoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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