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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e4d8eaa5e43c9c0606cc0590bfe76e649d185ab2d5b094e58b528295c57068' 
  AND token = 'l3CrZvOS0OikPgb8DnIGxdO/4DSJ3H3gDeoTxQA07j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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