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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c326d707fedffb8042294bb03ff4c4ed9338bad8819b8a63a9dfa41963e70f4' 
  AND token = 'bmvnt0dpiEJz4SebqCeXpfZ8KIQOfWT64991QPoGn9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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