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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e2f72d548e0898fb8066c61cf5d24dfbd24d5c6cd405db8d95e5fca32ee9a9' 
  AND token = 'cHKj/gzEYYLYvbytuvVOXRHUAgDhWuUid5ejia5xanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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