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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0732c2a29982c708a14a8780c40260f6545cbc27e664dd91829c67175879c7ff' 
  AND token = '2AQs8VGUl1EsUKkbxxZRB9VuoASq5Md4R8SeFAJNtBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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