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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e817476f7cbca3cacb186922d206aeeba5df11d26671a8a08da4c82d6db39a3' 
  AND token = 'kuDGPum5yQbH/FYHfHn0kpMAqhcCdeWe2XqNw0E9FvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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