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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec50e3937a565ac0746bc746b7d51790fb55fd3c87b4a8098f6c241b850693c' 
  AND token = 'rdI7rQF/LRNsWv0pI/eVn8rhM7VaJe2YhB4iTlH29js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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